Two-Sided Markets: Why Some Services Are Free for One Side
Card networks, app stores, and marketplaces serve two groups at once and price them very differently.
By Iris Penhaligon | Sep 20, 2026 | 6 min
A two-sided market connects two distinct groups that need each other — buyers and sellers, readers and advertisers, cardholders and merchants.
Platforms often charge one side little or nothing to attract the other.
I Examples
- — Payment cards — cardholders often pay no fee; merchants pay
- — Video game consoles — players and game developers
- — Online marketplaces — buyers and sellers
- — Search engines — users and advertisers
II Cross-side network effects
The value for one side depends on the size of the other. More buyers attract more sellers, and vice versa. Platforms subsidise the side that is harder to attract or more price-sensitive.
III Competition issues
Two-sided markets can tip toward a single dominant platform. Regulators examine fees charged to the paying side, such as app store commissions or card interchange fees.
This is general educational information about economics, not financial, investment, or tax advice. Consult a qualified, licensed professional before making financial decisions.
Further reading
- 1. Natural Monopolies: Why Some Markets Have Only One Supplier
- 2. Monopoly, Oligopoly, and Competition: How Market Structure Affects Prices
- 3. Barriers to Entry: Why New Competitors Struggle